No. In the UK, the general principle is that you are free to do anything unless the law specifically prohibits it. That differs from some European legal systems, where the approach can be more prescriptive.
Unless there is more context to this video than we are seeing, this looks like a significant overreach by the police.
Channel migrants are being given “instruction manuals” on how to cross in dinghies and claim asylum in the UK.
Handheld leaflets available in 16 languages, including Arabic, Pashto, and Farsi, warn asylum seekers to avoid windy conditions, dodge cargo ships and stay in their boats.
https://t.co/mCAkppZsqc